DSIC touts gas carrier repowering solution

The addition of a gas turbine could make old steam turbine powered gas carriers competitive again, suggest DSIC and GE Marine Solutions The addition of a gas turbine could make old steam turbine powered gas carriers competitive again, suggest DSIC and GE Marine Solutions

Dalian Shipbuilding Industry Co has proposed retrofitting gas turbines into LNG carriers previously powered by steam turbines as a way of extending service life and improving fuel efficiency.

The shipbuilder has worked with turbine provider GE Marine Solutions on a feasibility study that aims to provide a competitive retrofit solution for 10-15 year-old steam-powered gas carriers. The concept deploys GE’s combined gas turbine, electric and steam (COGES) system.

Yingbin Ma, deputy technical director, DSIC, said: “A gas turbine’s smaller footprint allows for the minimum necessary conversion work required by the shipyard. By converting to a COGES power system, the fuel efficiency of the ship will be improved by 30%. This allows ship owners to increase the charter rate and win back opportunities in a market dominated by dual-fuel diesel engines.”

The concept envisions a gas turbine being added to the vessel while the old steam generators are retained for power generation. The existing diesel generator will also remain, as a backup for the electric power system. The re-use of equipment helps reduce the total investment of the conversion.

The study is based on a 138,000m3 gas carrier and DISC said the concept can be applied on other ships of a similar size.

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